Campbell Scientific CS120A CS120A Visibility Sensor - Page 44

CS120A Visibility Sensor This part of the test will take approximately two minutes. Every ten seconds a dot should appear indicating that the test is progressing as normal. Calibration is now complete. Saving user settings Press any key to exit. Once the second stage of the test has been completed the new calibration constants will be saved automatically. All calibration constants including both the user and the factory setting can be viewed from menu item 4 from the main menu once the test is completed. 16. Performing an operating system update Operating system updates for the CS120A visibility sensor are performed using Campbell Scientifics' Device Configuration Utility (DevConfig) software. Please refer to the help built into the DevConfig software for full instructions on how to update the CS120A operating system. Note that CS120A operating systems cannot be installed on CS120 sensors. 17. Cleaning The CS120A visibility sensor is a robust instrument that will provide years of uninterrupted weather monitoring. Calibration of the instrument is carried out at the factory and can be redone easily on site with the optional CS120A calibrator or carried out by Campbell Scientific if required. Only general cleaning of the lenses is required to keep the sensor working efficiently. Cleaning of the CS120A will be required from time to time to ensure that the lenses are free from contaminants. The frequency of required cleaning depends on the exposure of the instrument to such contaminants. This will vary depending on the site location. The CS120A is capable of self diagnosing dirty lenses and will indicate in its output when the lenses are contaminated to such a degree that its visibility measurements may be affected. NOTE A lower level of contamination than is detected by the dirty window alarms, can affect the visibility measurements. The sensor will attempt to make a correction for contamination although the accuracy of that correction depends on the `type of dirt'. In any case we suggest 6 monthly intervals for locations not prone to contaminants and monthly intervals for those prone to contamination (roadside or airport use). In some cases more frequent cleaning may be required where there are high levels of contaminants and high dependency on the instrument output. CAUTION If the lenses require cleaning, it is very important that only a proper lens cloth or lens tissue be used. The use of inappropriate materials to clean the lenses can permanently damage or reduce the effectiveness of the lenses leading to errors in measurement of precipitation and visibility. It is advisable to use an air duster to blow any loose dust and dirt from the lenses as a first step. Using a lint free lens cloth or lens tissue impregnated with a small 34